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Coordination characteristics of trivalent lanthanides and actinides in molten hydrate salts of Ca(NO$$_3$$)$$_2$$ and CaCl$$_2$$

三価ランタノイド及びアクチノイドのCa(NO$$_3$$)$$_2$$及びCaCl$$_2$$水和物融体中における配位特性

藤井 俊行*; 奥出 元気*; 上原 章寛*; 関本 俊*; 林 博和; 赤堀 光雄; 湊 和生; 山名 元*

Fujii, Toshiyuki*; Okude, Genki*; Uehara, Akihiro*; Sekimoto, Shun*; Hayashi, Hirokazu; Akabori, Mitsuo; Minato, Kazuo; Yamana, Hajimu*

TBP溶液と水和物融体Ca(NO$$_3$$)$$_2cdotmathit{R}$$H$$_2$$O又はCaCl$$_2cdotmathit{R}$$H$$_2$$Oの間のCe(III), Am(III), Cm(III)の分配挙動を放射化学的手法で研究した。Ca(NO$$_3$$)$$_2cdotmathit{R}$$H$$_2$$O系では、Ce/Amの分離係数は最大12、Cm/Amの分離係数は最大1.7という結果が得られた。これらの元素の分配比は水和物融体中の水の活量の減少とともに増加し、水が少ない組成での抽出性能は水が多い組成よりも水の活量の影響を受けにくい。この傾向は、水和物融体中のNd(III)の吸光スペクトルで観察された配位状況の変化と似ている。

Distribution behavior of Ce(III), Am(III), and Cm(III) between tri-n-butyl phosphate solution and molten calcium nitrate hydrate Ca(NO$$_3$$)$$_2cdotmathit{R}$$H$$_2$$O or molten calcium chloride hydrate CaCl$$_2cdotmathit{R}$$H$$_2$$O was studied radiochemically. In Ca(NO$$_3$$)$$_2cdotmathit{R}$$H$$_2$$O systems, maximum separation factors of Ce and Cm to Am were observed to be 12 (Ce/Am) and 1.7 (Cm/Am). The distribution ratios of these elements increased with the decrease of water activity in the hydrates, and the extractabilities at the water deficient region was less sensitive compared to those at the water abundant region. This trend was similar to the coordination circumstance change observed in electronic absorption spectra of Nd(III) in the hydrates.

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パーセンタイル:52.23

分野:Chemistry, Analytical

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